Late answer, but I would have recommended string. Keeps it human readable 
and also, I suppose, not have to be concerned with endian order.

On Monday, May 2, 2016 at 10:27:30 AM UTC-7, Osman Ali wrote:
>
> Looking use a 128 bit uuid according to rfc4122. For Proto3 should use 
> bytes type?
>
> So:
>
> message SendIdentifier {
>  bytes user_uuid = 1;
> }
>
>
>

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